Maybe so, but if we only focus on "efficiency" we're going to end up living in dystopian nightmare, a very efficient one. Specifically regarding food, eating is not something purely functional for humans who are not seeking maximal efficiency but also enjoyment.
In Western countries population is already naturally dropping. What's needed first and foremost is a culture shift so that we stop seeing that as a negative. In any case, we have no choice because population cannot keep growing indefinitely in a finite space (which is what would lead to an actual dystopian outcome and we are getting there just looking at the state of the environment).
The very fact that you replied what you replied just now after I mentioned population levels shows how the public has been conditioned.
Compare: "In Western countries vegetarianism is already naturally rising" ... "What's needed first and foremost is a culture shift so that we stop seeing meat as a necessity" ... "We have no choice because livestock supply can't keep growing in a finite space" ... "The very fact that you commented as soon as you saw an anti-meat sentiment shows how the public has been conditioned" etc.
